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Tdengine biweekly selection of community issues | phase III
2022-07-05 14:04:00 【InfoQ】
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- Why do I write data in batches , Timestamp use NOW Function splicing will result in data loss ?
- How to smoothly expand the capacity of a cluster ?
- After cluster expansion ,DNode Status as Offline How to investigate ?
- How to smoothly shrink a cluster ?
- Novice benefits : Quick start TDengine modeling .
1. Why do I write data in batches , Timestamp use NOW Function splicing will result in data loss ?
2. How to smoothly expand the capacity of a cluster ?
- After the first node is successfully deployed , Install nodes to be added in sequence TDengine Server program , edit /etc/hosts, Add the domain name resolution of all nodes in the cluster ( If deployed DNS server, There is no need to edit ).
- The configuration file of the first node taos.cfg Copy to the node to be added , Will be one of the fqdn The parameter is changed to the node itself fqdn (hostname).
- Start the node to be added taosd service , Then enter taos The command line executes the following statement to add the node to be added into the cluster :CREATE DNode ‘Node2:6030’ .
- perform SHOW DNodes Check whether the status of the data node is Ready. by Ready On behalf of successful cluster expansion .
3. After cluster expansion ,DNode Status as Offline How to investigate ?
- View the node taosd Started or not 、 Whether the firewall is closed ;
- Confirm whether the data folder of the node to be added is empty ;
- Check all nodes /etc/hosts Whether the domain name resolution is complete 、 It works ( All nodes need to be resolved , Include arbitrator);
- The node firstEP、fqdn Whether the parameters are configured correctly .
4. How to smoothly shrink a cluster ?
- Get into taos Command line , perform SHOW DNodes Check the status of the node to be deleted , if ready Then proceed to the next step ;
- Delete the specified node from the current cluster DROP DNode ‘Node2:6030’ perhaps DROP DNode <DNodeId>.
- perform SHOW DNodes View the cluster node information , Finally, confirm that the information of the node to be deleted has disappeared from the list .
5. Novice benefits : Quick start TDengine modeling .
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